Redistribution of La-Al nearest-neighbor distances in the metallic glass Al{sub 0.91}La{sub 0.09}
- Department of Physics, Box 351560, University of Washington, Seattle, Washington 98195 (United States)
- School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv 69978 (Israel)
X-ray-absorption fine-structure (XAFS) measurements of metallic glass Al{sub 0.91}La{sub 0.09} and a crystalline phase Al{sub 11}La{sub 3} formed by annealing of the glass were made at the La {ital L}{sub 3} edge and analyzed by the splice method. The first-neighbor partial radial distribution functions about the La atoms for the crystal and glass were obtained at {ital T}=12 K demonstrating the difference between their local structures. The shortest La-Al distance (mean value 3.09{plus_minus}0.05 A) within the glass was distinctively smaller than within the crystal Al{sub 11}La{sub 3} (3.21{plus_minus}0.05 A). This partial shortening of the La-Al bonds decreases the size mismatch between the La and Al atoms making the glass formation more favorable with anomalously low content of La during the quench. Monte Carlo simulations were performed for the Al-La glass and agreement with the XAFS result was obtained. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 371339
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 2; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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